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Next thing I'd look at is the HTTP logs, then maybe try turning up the PHP error_reporting level to E_ALL if it's not already there.

Also, sometimes weird things happen if you copy-paste code in terms of non-printing unicode or other non-ASCII characters getting picked up by the copy, so you might want to re-edit the file in your text-only editor of choice.

Thanks

Thanks for your reply. Much appreciated.
I don't know where the http logs are.
In public_html, the folder Logs has convertor.log.txt, logfile.rtf and search_log.txt, none of which show anything regarding an error today.
Also the error_log file shows nothing since 05-21-13. All these files are CHMOD'd at 777.
I don't know what E_ALL is.
Additionally, I idn't copy and paste, I simply replaced search.php with search.php from another working site.
Any additional help will be appreciated.
Thanks again.

However, if the problem is a parse/compile error of some sort, that won't get triggered, in which case you would need to set it in either your php.ini config file or in .htaccess (via a php_value command).